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Lower Tephra (Iijima et al., 1968) Kobayashi et al., 1969

• Type locality: Omachi skii field, Nakayama, Omachi city, Nagano prefecture
• Loam
• middle Pleistocene
• Correlation: Upper Tama Loam

• Lithofacies: Loam

• Source: Tateyama volcano
• Thickness: 3.35 - 4 m
• Upper limit: Bottom of BSc
• Upper limit: Unconformity (Middle Tephra)
• Lower limit: Unconformity (Omine Formation, Conglomerate)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Omachi skii field, Nakayama, Omachi city, Nagano pref.; Kobuji, Ooka, Nagano city, Nagano pref.; Hijirikogen, Omi city, Higashichikuma city, Nagano pref.; Mount Jukanzan, Aoki city, Chiisagawa county, Nagano pref.; Mount Kyodaisan, Ueda city - Chikuma city - Sakaki city, Hanishina county, Nagano pref.
• Tephra: APm

• Kato (1980) Geology of the Sakaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 5p.)